CN113731024A - Pneumatic washing filter screen device for main pump shaft seal water of nuclear power plant - Google Patents
Pneumatic washing filter screen device for main pump shaft seal water of nuclear power plant Download PDFInfo
- Publication number
- CN113731024A CN113731024A CN202111139879.4A CN202111139879A CN113731024A CN 113731024 A CN113731024 A CN 113731024A CN 202111139879 A CN202111139879 A CN 202111139879A CN 113731024 A CN113731024 A CN 113731024A
- Authority
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- China
- Prior art keywords
- pipeline
- filter screen
- power plant
- nuclear power
- main pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000005406 washing Methods 0.000 title claims description 15
- 239000010865 sewage Substances 0.000 claims abstract description 27
- 238000011001 backwashing Methods 0.000 claims abstract description 17
- 238000010992 reflux Methods 0.000 claims abstract description 7
- 238000005192 partition Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 abstract description 8
- 239000002826 coolant Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 241000295146 Gallionellaceae Species 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D41/00—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids
- B01D41/04—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids of rigid self-supporting filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
The invention belongs to a filter screen flushing device, and particularly relates to a pneumatic filter screen flushing device for main pump shaft seal water of a nuclear power plant. The device comprises a main pipeline, wherein the main pipeline is connected with the pipeline through a reflux valve, the side end of the lower part of the pipeline is connected with a sewage discharge pipeline, and the side end of the upper part of the pipeline is connected with a backwashing pipeline. Has the advantages that: when the valve is in normal operation, demineralized water flows upwards from the bottom through the pipeline, the drain pipe is closed after the reverse flow valve is pushed, then the filter screen upwards passes through, when the filter screen is blocked, the filter screen is pressed upwards by water, the connecting rod is driven to drive the valve to be opened, the back flush water pipe is opened after the push rod is pushed by gas to rotate the ball valve, the back flush water flows into the pipeline to enable the pipe to be filled with water, the reverse flow valve rebounds, the drain pipe is opened, the water above the drain pipe is discharged through the drain pipe, the reverse flow valve is pushed open after the filter screen is communicated, the drain valve is closed, the filter screen returns to the original position, the ball valve is pulled back to the original position by the spring, a passive structure is adopted, automatic triggering is realized, and the labor cost is greatly reduced.
Description
Technical Field
The invention belongs to a filter screen flushing device, and particularly relates to a pneumatic filter screen flushing device for main pump shaft seal water of a nuclear power plant.
Background
The reactor coolant pump is one of the key devices of a nuclear power plant, being the heart of the nuclear power plant. It forces the coolant in a loop to circulate, thus transferring the heat energy generated in the reactor to a steam generator to generate steam to drive a turbine to do work. If the reactor coolant pump is frequently stopped, huge economic loss can be caused to a power plant.
The shaft seal is an important component of a reactor coolant pump, is a key for the normal operation of a main pump, is a device for controlling the leakage of the reactor coolant along the shaft of the main pump, and consists of three stages of seal main parts of NO.1, NO.2 and NO.3 which are arranged in series, and the service life of a shaft seal determines the maintenance period of the main pump. The third stage shaft seal is used for lubricating the shaft seal surface and preventing boron from separating out by injecting sealing water, and the sealing water injected by the third stage shaft seal is from the shaft seal stand pipe. The normal operation of the third-stage shaft seal is ensured, and the shaft seal vertical pipe is required to smoothly and stably supply water. The condition that a filter screen is blocked by microbial corrosion products for many times recently happens in a certain nuclear power plant, so that the water supply is insufficient, and the normal operation of a unit is influenced. Although the shaft seal water is demineralized water, because a balance pipe is arranged on the vertical pipe and is connected with the atmosphere to balance the air pressure in the vertical pipe, the interior of the vertical pipe is directly communicated with the atmosphere, so that a large amount of air is dissolved in the water, the content of bacteria and oxygen in the water is continuously increased, and the pig iron bacteria are easily collected in the vertical pipe. The iron bacteria can convert ferrous ions into ferric ions to generate a large amount of corrosion products which are insoluble in water, and the corrosion products are aggregated at the position of the flow orifice plate after passing through the pipeline to cause pipeline blockage, so that the normal operation of the main pump is influenced.
Therefore, in order to solve the problem of filter screen blockage during the normal operation of the unit, the pneumatic filter screen flushing device is urgently needed to ensure the normal operation of the pipeline during the normal operation of the unit.
Disclosure of Invention
The invention aims to provide a pneumatic filter screen flushing device for main pump shaft seal water of a nuclear power plant, which solves the problem that a filter screen is blocked by corrosion products through structural optimization.
The technical scheme of the invention is as follows: a pneumatic filter screen flushing device for main pump shaft seal water of a nuclear power plant comprises a main pipeline, wherein the main pipeline is connected with a pipeline through a reverse flow valve, the side end of the lower portion of the pipeline is connected with a sewage discharge pipeline, and the side end of the upper portion of the pipeline is connected with a reverse flush pipeline.
An air source pipeline is further arranged below the joint of the pipeline and the backwashing pipeline, the air source pipeline is of a T-shaped structure and is provided with three end portions, one end of the air source pipeline is connected with the pipeline, and the side face of one end of the air source pipeline is connected with the opening end of the U-shaped pipe.
The reverse-flow valve pass through the screw thread and be connected with pipeline and main part pipeline respectively, the inside of reverse-flow valve includes the spring, the location support, pipe box and removal pin, the one end of location support is passed through the helicitic texture and is cup jointed in the outside of pipeline, the one end of pipe box is cup jointed outside main part pipeline through the helicitic texture, the location support passes through the helicitic texture suit outside the pipe box, be equipped with the removal pin between location support and the pipe box, the centre of removing the pin is the form separation blade, the both ends of separation blade are the round bar structure respectively, the upper and lower pole portion of removing the pin passes location support and pipe box respectively, the cover is equipped with the spring on the round bar of upper portion, the separation blade and the spring of removing the pin all are located between location support and the pipe box.
The end part of the movable stop lever, which penetrates through the round rod of the positioning support, is also connected with a connecting rod, the connecting rod extends into the interior of the sewage discharge pipeline, the connecting rod is connected with a sewage discharge baffle, and the end part of the sewage discharge pipeline is provided with a sewage discharge outlet.
The middle position of pipeline be equipped with middle filter screen, middle filter screen covers the port of air supply pipeline, the air supply pipeline is deep into in the pipeline, the inside at the position that the air supply pipeline is located the pipeline is equipped with the stand, the stand overcoat has the spring, the stand is connected with the connecting rod, the connecting rod is connected with sector baffle.
The air source pipeline is internally provided with a partition plate, the partition plate is provided with an air source hole, the air source hole is communicated with the air pipe, and the fan-shaped baffle plate covers the air source hole.
An I-shaped cylindrical rod is arranged in one end of the U-shaped pipe, and an exhaust port is formed in the side surface of the end part.
The inside of the backwashing pipeline is provided with a ball valve, and the outside of the ball valve in the backwashing pipeline is provided with a filter screen.
And a ball valve rod is arranged at the position, corresponding to the ball valve, of the outer side of the backwashing pipeline.
The rod part of the ball valve rod is connected with one end of a spring, and the other end of the spring is connected with the outer wall surface of the backwashing pipeline.
The invention has the beneficial effects that: during normal operation, demineralized water flows upwards from the bottom through the pipeline, the blow-off pipe is closed after the reverse flow valve is pushed, then, the filter screen is upwards passed through, when the filter screen is blocked, the filter screen is upwards pressed by water, the connecting rod is driven to drive the valve to be opened, the back flush water pipe is opened after the gas pushes the ejector rod to enable the ball valve to rotate, the back flush water flows into the pipeline to enable the pipe to be filled with water, the reverse flow valve rebounds, the blow-off pipe is opened, the upper water can flush the filter screen to be discharged through the blow-off pipe, the reverse flow valve is pushed open after the filter screen is communicated, the blow-off valve is closed, the filter screen returns to the original position, the valve is closed, the ball valve is pulled back to the original position by the spring, the waterway normally operates, the gas source adopts a passive structure, automatic triggering is realized, and the labor cost is greatly reduced.
Drawings
FIG. 1 is a schematic overall view of a pneumatic washing filter unit for seal water of a main pump of a nuclear power plant, provided by the invention;
FIG. 2 is a back schematic view of a pneumatic washing filter device for shaft seal water of a main pump of a nuclear power plant, provided by the invention;
FIG. 3 is a cross-sectional view of the main conduit;
FIG. 4 is a cross-sectional view of the U-tube and the gas supply line.
In the figure: the device comprises a backwash pipeline 1, a sewage discharge pipeline 2, a reflux valve 3, a main pipeline 4, a ball valve rod 5, a spring 6, an air source pipeline 7, a U-shaped pipe 8, a ball valve 9, a filter screen 10, a fan-shaped baffle 11, a connecting rod 12, a column 13, a spring 14, a middle filter screen 15, a connecting rod 16, a sewage discharge baffle 17, a sewage discharge outlet 18, a positioning support 19, a spring 20, a movable stop rod 21, an air pipe 23, an air source hole 24, an I-shaped cylindrical rod 25, an air outlet 26, a pipeline 27, a pipe sleeve 28 and a partition plate 29.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The invention provides a pneumatic filter screen flushing device for main pump shaft seal water of a nuclear power plant, which is mainly divided into two parts, namely a linkage mechanism of a reflux valve 3 and a sewage discharge valve port 2, and a linkage mechanism of a filter screen 15 and an air source 7.
As shown in figure 1, the pneumatic washing filter screen device for the shaft seal water of the main pump of the nuclear power plant comprises a main pipeline 4, wherein the main pipeline 4 is connected with a pipeline 27 through a reflux valve 3, the side end of the lower part of the pipeline 27 is connected with a sewage discharge pipeline 2, and the side end of the upper part of the pipeline 27 is connected with a back washing pipeline 1.
As shown in fig. 2 and 4, an air source pipeline 7 is further connected below the joint of the pipeline 27 and the backwashing pipeline 1, the air source pipeline 7 is of a T-shaped structure and has three end portions, one end of the air source pipeline is connected with the pipeline 27, and the side surface of one end of the air source pipeline is connected with the opening end of the U-shaped pipe 8.
As shown in fig. 3, the reverse flow valve 3 is respectively connected with the pipeline 27 and the main pipeline 4 through threads, the reverse flow valve 3 comprises a spring 20, a positioning support 19 and a moving stop lever 21 inside, one end of the positioning support 19 is sleeved outside the pipeline 27 through a threaded structure, one end of the pipe sleeve 28 is sleeved outside the main pipeline 4 through a threaded structure, the positioning support 19 is sleeved outside the pipe sleeve 28 through a threaded structure, the moving stop lever 21 is installed between the positioning support 19 and the pipe sleeve 28, the middle of the moving stop lever 21 is a disk-shaped stop piece, two ends of the stop piece are respectively in a round bar structure, an upper rod part and a lower rod part of the moving stop lever 21 respectively pass through the positioning support 19 and the pipe sleeve 28, the spring 20 is sleeved on the upper round bar, the stop piece and 20 of the moving stop lever 21 are both located between the positioning support 19 and the pipe sleeve 28, the end part of the moving stop lever 21 passing through the round bar of the positioning support 19 is further connected with one end of the connecting rod 16, the connecting rod 16 extends into the sewage discharge pipeline 2, the other end of the connecting rod 16 is connected with a sewage discharge port baffle 17, and the end part of the sewage discharge pipeline 2 is provided with a sewage discharge port 18; the middle position of the pipeline 27 is provided with a middle filter screen 15, the middle filter screen 15 covers the port of the air source pipeline 7, the part of the air source pipeline 7 extending into the pipeline 27 is of an L-shaped structure, the inside of the part of the air source pipeline 7 positioned in the pipeline 27 is provided with an upright column 13, the outer of the upright column 13 is sleeved with a spring 14, the upright column 13 is connected with a connecting rod 12, the connecting rod 12 is connected with a fan-shaped baffle plate 11, as shown in fig. 4, the air source pipeline 7 is internally provided with a partition plate 29, the partition plate 29 is provided with an air source hole 24, the air source hole 24 is communicated with an air pipe 23, the fan-shaped baffle plate 11 covers the air source hole 24, the inside of one end of the U-shaped pipe 8 is provided with an I-shaped cylindrical rod 25, and the side surface of the end part is provided with an air outlet 26. As shown in fig. 3, a ball valve 9 is arranged in the backwash pipeline 1, a filter screen 10 is arranged outside the ball valve 9 in the backwash pipeline 1, a ball valve rod 5 is arranged at a position corresponding to the ball valve 9 outside the backwash pipeline 1, one end of a spring 6 is connected to the rod part of the ball valve rod 5, and the other end of the spring 6 is connected to the outer wall surface of the backwash pipeline 1.
The working process of the invention is as follows:
the water source flows upwards from the bottom of the main pipeline 4, firstly passes through the reflux valve 3, the reflux valve 3 is connected with pipelines at two sides through threads, the internal structure comprises a spring 20, a positioning support 19 and a movable stop lever 21, the movable stop lever 21 is pressed upwards under the action of water pressure, at the moment, the top of the movable stop lever 21 is pressed downwards through a sewage discharge outlet baffle 17 connected with a connecting rod 16, a sewage discharge outlet 18 is closed, water upwards passes through an upper filter screen 15 to be filtered and enters a main pump, when the filter screen is blocked due to too much filtered impurities, the pressure at two sides of the filter screen is unbalanced, the filter screen is pressed upwards, a stand column 13 on the filter screen drives a fan-shaped baffle 11 to rotate through a connecting rod 12, at the moment, an air source hole 24 is communicated with an air pipe 23, an air source is provided by an air storage tank and is connected with the fan-shaped baffle through an air pipe, air enters the U-shaped pipeline 8 through the air source hole, one side of the U-shaped pipeline is provided with an I-shaped rod 25, the gas pushes the I-shaped cylindrical rod 25 to be pushed forwards to push the ball valve rod 5 to rotate, so that the passage of the ball valve 9 is formed, then water in the backwashing pipeline 1 is flushed into the pipeline, at the moment, the pipeline is filled with water, the backflow valve 3 rebounds to drive the sewage discharge baffle 17 to be lifted, the water above the backflow filter screen 15 drives impurities to flow out from the sewage discharge outlet 18 after backwashing, at the moment, the filter screen 15 rebounds, the air source hole is closed, the ball valve rod 5 is pulled back by the spring 6 connected to the pipe wall to drive the I-shaped cylindrical rod in the U-shaped pipe 8 to move downwards, and because a small gap is reserved between the I-shaped cylindrical rod at the lower end and the pipe wall, the gas in the U-shaped pipe can be discharged from the air outlet 26 of the U-shaped pipe through the gap. Meanwhile, the reverse flow valve is pressed, the sewage discharge port is closed, and water enters the main pump through the filter screen.
During the operation of the unit, the demineralized water pushes the reverse-flow valve 3 from the bottom of the main body pipe 4 upwards through the sieve 15 to the main pump, when the filter screen is blocked due to excessive impurity filtering, the filter screen is pressed up by the water at the lower part due to the pressure, at the moment, the upright post 13 above the filter screen drives the connecting rod 12 to push the fan-shaped baffle plate 11, the air source port 24 is communicated with the air pipe 23, the air pushes the I-shaped cylindrical rod 25 to move upwards, further pushing the ball valve rod 5 to rotate, opening the ball valve 9, enabling backwash water to enter the pipeline, rebounding the backwash valve to drive the sewage discharge port 17 to open, driving impurities to flow out of the sewage discharge port through the washing filter screen, meanwhile, the filter screen returns to the original position, the air source hole is closed, the spring drives the ball valve rod to return, the backwashing pipeline is closed, the backflow valve is pressed by water below, the drain outlet is closed, and the water way normally runs at the moment, so that the normal running of the unit in the overhaul period can be ensured.
Claims (10)
1. The utility model provides a main pump bearing seal water of nuclear power plant washes filter screen device with pneumatics which characterized in that: the device comprises a main pipeline, wherein the main pipeline is connected with the pipeline through a reflux valve, the side end of the lower part of the pipeline is connected with a sewage discharge pipeline, and the side end of the upper part of the pipeline is connected with a backwashing pipeline.
2. The pneumatic washing filter screen device for the seal water of the main pump of the nuclear power plant as claimed in claim 1, wherein: an air source pipeline is further arranged below the joint of the pipeline and the backwashing pipeline, the air source pipeline is of a T-shaped structure and is provided with three end portions, one end of the air source pipeline is connected with the pipeline, and the side face of one end of the air source pipeline is connected with the opening end of the U-shaped pipe.
3. The pneumatic washing filter screen device for the seal water of the main pump of the nuclear power plant as claimed in claim 1, wherein: the reverse-flow valve pass through the screw thread and be connected with pipeline and main part pipeline respectively, the inside of reverse-flow valve includes the spring, the location support, pipe box and removal pin, the one end of location support is passed through the helicitic texture and is cup jointed in the outside of pipeline, the one end of pipe box is cup jointed outside main part pipeline through the helicitic texture, the location support passes through the helicitic texture suit outside the pipe box, be equipped with the removal pin between location support and the pipe box, the centre of removing the pin is the form separation blade, the both ends of separation blade are the round bar structure respectively, the upper and lower pole portion of removing the pin passes location support and pipe box respectively, the cover is equipped with the spring on the round bar of upper portion, the separation blade and the spring of removing the pin all are located between location support and the pipe box.
4. The pneumatic washing filter screen device for the seal water of the main pump of the nuclear power plant as claimed in claim 3, wherein: the end part of the movable stop lever, which penetrates through the round rod of the positioning support, is also connected with a connecting rod, the connecting rod extends into the interior of the sewage discharge pipeline, the connecting rod is connected with a sewage discharge baffle, and the end part of the sewage discharge pipeline is provided with a sewage discharge outlet.
5. The pneumatic washing filter screen device for the seal water of the main pump of the nuclear power plant as claimed in claim 1, wherein: the middle position of pipeline be equipped with middle filter screen, middle filter screen covers the port of air supply pipeline, the air supply pipeline is deep into in the pipeline, the inside at the position that the air supply pipeline is located the pipeline is equipped with the stand, the stand overcoat has the spring, the stand is connected with the connecting rod, the connecting rod is connected with sector baffle.
6. The pneumatic washing filter screen device for the seal water of the main pump of the nuclear power plant as claimed in claim 1, wherein: the air source pipeline is internally provided with a partition plate, the partition plate is provided with an air source hole, the air source hole is communicated with the air pipe, and the fan-shaped baffle plate covers the air source hole.
7. The pneumatic washing filter screen device for the seal water of the main pump of the nuclear power plant as claimed in claim 2, wherein: an I-shaped cylindrical rod is arranged in one end of the U-shaped pipe, and an exhaust port is formed in the side surface of the end part.
8. The pneumatic washing filter screen device for the seal water of the main pump of the nuclear power plant as claimed in claim 1, wherein: the inside of the backwashing pipeline is provided with a ball valve, and the outside of the ball valve in the backwashing pipeline is provided with a filter screen.
9. The pneumatic washing filter screen device for the seal water of the main pump of the nuclear power plant as claimed in claim 1, wherein: and a ball valve rod is arranged at the position, corresponding to the ball valve, of the outer side of the backwashing pipeline.
10. The pneumatic washing filter screen device for the seal water of the main pump of the nuclear power plant as claimed in claim 9, wherein: the rod part of the ball valve rod is connected with one end of a spring, and the other end of the spring is connected with the outer wall surface of the backwashing pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139879.4A CN113731024A (en) | 2021-09-28 | 2021-09-28 | Pneumatic washing filter screen device for main pump shaft seal water of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139879.4A CN113731024A (en) | 2021-09-28 | 2021-09-28 | Pneumatic washing filter screen device for main pump shaft seal water of nuclear power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113731024A true CN113731024A (en) | 2021-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111139879.4A Pending CN113731024A (en) | 2021-09-28 | 2021-09-28 | Pneumatic washing filter screen device for main pump shaft seal water of nuclear power plant |
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| CN (1) | CN113731024A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115445300A (en) * | 2022-08-15 | 2022-12-09 | 中核核电运行管理有限公司 | Nuclear power plant main pump shaft seal water riser reciprocating flushing type corrosion product discharging device |
-
2021
- 2021-09-28 CN CN202111139879.4A patent/CN113731024A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115445300A (en) * | 2022-08-15 | 2022-12-09 | 中核核电运行管理有限公司 | Nuclear power plant main pump shaft seal water riser reciprocating flushing type corrosion product discharging device |
| CN115445300B (en) * | 2022-08-15 | 2023-09-08 | 中核核电运行管理有限公司 | Nuclear power plant main pump shaft seal water vertical pipe reciprocating flushing type corrosion product discharge device |
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